Effect of chronic stress on the repair of cutaneous wounds in rats
AbstractPurpose: The aim of this study was to determine the effect of different types of chronic stress on the contraction of cutaneous wounds on the back of rats. Methods: Nineteen rats were randomly divided into two groups: chronic stress - GCS (n=9) and control – GC (n=10). The GCS were subjected to testing of chronic stress (exposure to light flashing, isolation, crowded environment, noise and smell of blood) throughout the experiment for a period of 10 days. The animals were anesthetized, and a surgical wound with area of 1 cm2 was made on the back of each animal, preserving the muscle tissue. The measurements of the wounds were made by a blinded examiner at 3, 7 and 12 days after surgery, using a digital caliper. The contraction of the wound was measured using the following formula: (initial area – area on the day of measurement) / initial area × 100 = percentage of wound contraction. Data were analyzed by Student t test for independent samples. Results: The results showed a lower rate of wound contraction in stressed animals at 7 and 12 days after surgery in comparison with the control group. Conclusion: Based on the methods and the animal model used, it was possible to conclude that rats subjected to chronic stress have delayed wound contraction during repair.
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